Add two missing diagnostics entries (#7634)

* Update diagnostics.go

* Fix config setting name SessionIdleTimeoutInMinutes

* Update diagnostics.go

config/default.json

@@ -36,7 +36,7 @@
         "SessionLengthMobileInDays": 30,
         "SessionLengthSSOInDays": 30,
         "SessionCacheInMinutes": 10,
-        "SessionIdleTimeout": 0,
+        "SessionIdleTimeoutInMinutes": 0,
         "WebsocketSecurePort": 443,
         "WebsocketPort": 80,
         "WebserverMode": "gzip",